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It FETERS. PHOTQUTMDGRAPIIER. WASHINGTON. D. C,

'ttittt tatza @anni affine,

WILLIAM ]I.A SINGR, OF PITTSBURG', PENNSYLVANIA.`

Letters Patent Ne 109,953, dated December' t, 1870.

I MPRovEMi-:N-r Fon cavi-:LING THE ences oF CIRCULAR PLATES oF METAL.

The Schedule referred to in than Letters Patent and making Dart of the same.

, Beit known that I, WILLIAM H. SINGER, of Pittsburg, in the county of Allegheny and State 'of Pennsylvania, have invented a new and improved Machine for Beveling Circular Plates' of Metal; and I do hereby declare thefollowing to be a full, clear, and exact .descriptionof the same, reference being had tothe accompanying drawing making a part ot' this specication, in which- A Figure 1 is a sectional elevation, andv Figure 2 is a detacl-iedhorizontal section.'

This invention is an improvement on that for which Letters Patent-No. 9T,450, dated November 30, 1869, were granted me., A

That invention consists of tapering rolls placed upon rotatory shafts, for the purpose ot' prod ncing beveled edges. upon metal implements, in combination with a sliding rest for supporting the blanks while undergoing the beveling operation. 1f the'blanks are circular they are placed on a vertical pin, stepped in s nch slidin'g rest, said pin passing through a central hole in each blank, and Aforming the aXis around which the blank revolves under the bite of the rolls uponits edge e Since obtaining said patent, I have found that during the'revolutionof the circular blankupon the-pin, the central hole of the blank is enlarged considerably beyond its proper size, owing to `'the 'drawing ofthe blank by the' rolls against the pin.

The object of this invention is to provlde a mech;

anism thatf'holds the circular blank while its edges are beveling, without enlarging the -central hole, and' the mechanismby .which this object is accomplished also secures another advantage, namely, that ot' introducing the whole of that part of theblank that is to v bebeveled, between the rolls at once.

',lhe aforesaid mechanism is hereinafter fully de scribed.

Referring to the drawing- A are the rollhousings; 13,1 the shafts; C,- the rolls;

l), the guide-restyand E, tbe 'sliding rest; the arrangement of all which is fully described in the patent above referred to.

F` is a frame, pivoted by a pin,'b,`at`its rear end, to the rear' end 'of the sliding rest E.

-Parallel ribs a, curved in arcs, the centers of which are et the center of the pin l), are formed on the upper side ofthe sliding rest-E.

The design is that the frame F shall swing later. all-y as far as may be necessary to the removal and Ainsertion of the blanks, the function of t-he ribs a being to diminish thefriction of such swinging.

rlhe frame Fis formed in two branches c d,- one above the other, the branch al supporting the-horizontal disk e, by means of' a pin from the latter entering a hole i-n the branch, of sizesutiicient to admit of the -free rotation of the disk, and the branch c supporting theh'orizontal disk f which vis attached to the .lower extremity of the stud h, that passes through a vertical orifice in the branch c, and is swveled at its upper end in a socket, i, that is jointed to -a lever, k, the front extremity ot' which is pivoted ,in an arm, Z, that projects upward from the branch c, \vhile the rear partei'.

the lever k is sustained adjustably in a rack, m, formed ina second arm, n, that likewise projects upward from the branch c in rear ofthe arm Z.

The disk fis placed immediately .above the disk e,

and between the two disks the circular blank is-inl serted while the frame Fis swung aside, the blank being clamped between thedisks by pressing down the lever lo. The `frame bearingthe blank is then swung in 4un- 'til the part of the blank that is to bebeveled is intro-A duced between the rolls. I

The rotation of the lat-terproduces the rotation of the blank whose edge is beveled between the rolls as it revolves. v v

v The disks e f rotate 'eelyivith the blank, and the latter centers itself with the utmost accuracy between the disks.

By. means of the screw I the sliding rest is adjusted lengthwise to suit blanks of different sizes.

In my former invention this screw was the only means for introducing the blank between the rolls, and' hence the blank couldonly be inserted gradually.

The swinging frame admits of introducing the whole of the desired width of blank between the' rolls at once.

Having thus described my invention, Y AWhat I claim as new, and desire to secure by Letters Patent, is-` The rolls O- O, in combination ,with the swingiug. frame F, rotatory disks e f, and the lever k, or its' equivalent, substantially as described.

l WM.l SIN GER.;

Witnesses:

' Sonon C.l KEMON,

Trios'. D; D. Oumma. 

